- Natural large-scale and long-term change in the Earth's climatic system, as brought about by ice ages.
- Large-scale and long-term change in the Earth's climatic system produced by global warming; anthropogenic climate change.
2013 September-October, Michael Sivak, “Will AC Put a Chill on the Global Energy Supply?”, in American Scientist:
- Nevertheless, it is clear that the global energy demand for air-conditioning will grow substantially as nations become more affluent, with the consequences of climate change potentially accelerating the demand.
changes in the Earth's climate